/*
 * Copyright 20011-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.sn.solr.utils.common;

import java.text.DecimalFormat;

/**
 * <code>SolrHelper</code> class provides utility methods for the project 
 * as a whole. Functions calculation execution time & finding out if passed 
 * value is of particular type.
 * 
 * 
 * @author Sathiya N Sundararjan
 * @since 0.1.0
 */
public class AppHelper{
	
	static final DecimalFormat NUMBER_FORMAT = new DecimalFormat("##.####");
	
	public static String getDiffTime(long startTime){
		return NUMBER_FORMAT.format((System.nanoTime()-startTime) * 0.000001) + " ms";
	}
	
	public static boolean isInteger(String str) {
		if (str == null) {
			return false;
		}
		int length = str.length();
		if (length == 0) {
			return false;
		}
		int i = 0;
		if (str.charAt(0) == '-') {
			if (length == 1) {
				return false;
			}
			i = 1;
		}
		for (; i < length; i++) {
			char c = str.charAt(i);
			if (c <= '/' || c >= ':') {
				return false;
			}
		}
		return true;
	}

}
